Yes, but according to my research they're not likely to show up in the same place twice, and even if they do it's usually not until four or five years have passed. Therefore, I'm going to let you in on the secret of where I found them:

Don't tell ...

My back yard.

I was delayed in getting the lawn mower around for the season, and when I finally did -- there they were, almost two dozen of them. I promised my wife I wouldn't tell, but as I said, I did some research into it. We have no idea how they ended up there, but the chances of seeing them again anytime soon are pretty slim, at least in a town lawn.